CNC lathe in SS 316
CNC turning rotates the workpiece against stationary or live tooling to produce concentric shafts, bushings, pins, and threaded studs. Diameter control and roundness come naturally from the spindle axis, which makes the lathe the first choice for revolved geometry. Use turning when OD/ID features dominate and prismatic milling would only add flats or cross-holes as secondary work.
SPEC short slug ss-316 (material_id SS 316). Properties stay unknown until materials API verifies.
When to choose CNC Turning
- Parts of revolution: shafts, spacers, collars, and threaded fasteners from bar or tube
- Tight concentricity between OD and ID that is awkward to hold across mill setups
- Groove, face, and thread features that a single chucking can finish end-to-end
- Bar-fed production where cycle time favors lathe magazines over vise milling
- When L/D is manageable with tailstock support and milling content is minimal
Setup and fixturing
- Collet or soft-jaw chuck bored to the blank diameter for round aluminum without crush marks
- Tailstock live center or steady rest once stick-out approaches ~3–4× diameter
- Bar puller / feeder for repeating blanks; part-off with adequate face stock for the next piece
- Coolant aimed at the tool nose — aluminum turning loves flood to prevent built-up edge
- For thin-wall tubes: plug mandrels or reduced jaw force plus finish passes after roughing
Typical operations
- Facing and rough OD turning to clear bar scale and establish diameter stock
- Finish OD/ID passes with sharp inserts for size and surface finish
- Grooving and parting with dedicated groove tools and correct width relief
- Single-point or tap threading on OD/ID; verify major/pitch diameter on first article
- Live-tool cross-drilling or milling flats when mill-turn is available (else second op)
DFM watch-outs
- Long slender bars chatter without tailstock — shorten blank or add support
- Thin tubular walls ovalize under chuck pressure; use soft jaws and light finishes
- Unrelieved grooves and sharp internal shoulders need special tooling or redesign
- Sharp internal corners at OD steps may need a radius insert or secondary mill
- Part-off leaves a pip — plan a face cleanup or design a chamfer into the parting side
- Cross-holes and wrench flats imply live tooling or a follow-on mill setup after turning
Capability
On a CNC lathe the spindle spins the stock while tools on the turret plunge, traverse, and groove. Concentric diameters, tapers, and threads share one rotational datum, which is why turned parts hold roundness and runout more naturally than the same features milled from hex bar. Programming centers on tool nose radius compensation, feed per revolution, and safe retracts past shoulders. Live tooling expands the cell into mill-turn territory for flats and radial holes without leaving the chuck, but pure turning remains fastest for OD/ID-only drawings.
Lathe hourly and setup in rates sit below 3-axis milling for this shop card — again, that is capability metadata. Public hub mid bands for identical SAMPLE_GEOM materials stay aligned with other CNC process hubs until the quote engine applies lathe variants. Differentiate turning hubs with revolved DFM language, L/D stick-out guidance, and chucking notes rather than invented dollar deltas on the shared price table.
Rates record lathe spindle time at 22/h with setup 20. Quote cards may show these rates as process capability. Shared Al6061 hub mids with 3-axis/5-axis are expected today — do not fabricate a turning discount in the public band table.
Batch1 URL slug is cnc-turning; process_slug_map also has cnc-lathe → CNC/lathe. Platform must alias both.
DFM lines for CNC Turning
- Turned bars with length/diameter above ~3–4× without a tailstock or steady rest chatter; thin tubular walls under 0.8 mm amplify ovality under chuck pressure.
- Sharp internal shoulders and unrelieved grooves force special form tools on the lathe — add groove relief or accept slower cycle time.
- Concentric OD/ID stacks belong on the lathe; prismatic flats and cross-holes may need mill-turn or a second op after parting.
- Bbox longest/shortest ≥ 8 on bar stock usually means long stick-out — specify live center or rewrite as shorter blanks.
- Tubular sections under 1.5 mm wall need soft jaws and light finish passes to hold roundness after roughing.
Stainless Steel 316
316 stainless adds molybdenum for improved pitting resistance versus 304 in chloride-leaning environments — common for medical-adjacent hardware, lab fixtures, and marine-ish industrial parts (without claiming regulated device certification). Machining is similar to 304 but often a bit tougher; keep chip load honest.
Differentiate from 304 with Mo/pitting framing and passivate/polish finish paths from enrich. Never reuse 304 “food-adjacent” as the only lede — spell 316. No anodize. No fabricated materials-standard badges.
Same stainless discipline: sharp carbide, no dwelling, peck drills, rigid workholding. Watch work-hardening on interrupted cuts. Turning needs correct SS geometries and flood coolant.
316 leaf SAMPLE_GEOM band — rates-true; do not invent medical certification premiums in the public mid.
316 turning: SS chip control, soft jaws for tube, verify OD before passivate.
This alloy hub
Finish compatibility on this hub is framed for a single alloy family: list only finishes that enrich marks compatible with this material_slug. Do not present a cross-material finish menu here — that belongs on industry hubs that span alloys.
Open the properties block with this material’s density, typical temper/condition (when known from catalog), and machining character. The table is alloy-centric: one row set, not a comparison across all Batch1 metals and polymers.
Price band on a process×material hub is the SAMPLE_GEOM band for this one material (often qty1/10 sit on the min-order floor). Say “for this alloy on the sample geometry,” never “across aerospace-to-medical mixes.” Child industries share the same mid until industry is wired into comboQuote.
On turning material hubs, stress bar/tube chucking and OD/ID finish for this alloy — not industry program narratives.
Public price range
Aggregated from Batch1 child leaves for this hub (4 pages). USD, rates v1.1, public ±12% on the 50×50×20 mm sample. Compare qty 10 $164.7 ($144.94–$184.47); qty 100 $909.01 ($799.93–$1018.09).
| Qty | Low | Mid | High | Status | Leaves priced | Lead days |
|---|---|---|---|---|---|---|
| 1 | $70.4 | $80 | $89.6 | priced | 4 | 7–12 (mid 10) |
| 10 | $144.94 | $164.7 | $184.47 | priced | 4 | 7–12 (mid 10) |
| 100 | $799.93 | $909.01 | $1018.09 | priced | 4 | 7–12 (mid 10) |
| 500 | $3925.72 | $4461.04 | $4996.37 | priced | 4 | 7–12 (mid 10) |
316 leaf SAMPLE_GEOM band — rates-true; do not invent medical certification premiums in the public mid. Price band on a process×material hub is the SAMPLE_GEOM band for this one material (often qty1/10 sit on the min-order floor). Say “for this alloy on the sample geometry,” never “across aerospace-to-medical mixes.” Child industries share the same mid until industry is wired into comboQuote. Not a confirmed order price.
Process comparison
Qty 10 public mid is the median of process×material hub mids, with the span of those mids in parentheses. Tolerance labels and finish names come from the hubs-enrich pack. The machine-rate column is the rates card, not a part price.
| Process | Qty 10 price band | Tolerance | Finishes | DFM | Machine rate |
|---|---|---|---|---|---|
| CNC 3-axis (CNC 三轴) | $117.92 median ($80–$290.74) | ISO 2768-m; ±0.05 mm; ±0.025 mm; tighter needs manual | 8: Bead Blast, Powder Coat, Polish, Nickel/Zinc Plate, Anodize, Hard Anodize, Black Oxide, Passivate | On 3-axis mills, walls thinner than 0.8 mm (2V/A proxy) chatter and deflect under end-mill load — thicken or add ribs before quoting as production. | $25/h, setup $30 |
| CNC 5-axis (CNC 五轴) | $117.92 median ($80–$290.74) | ISO 2768-m; ±0.05 mm; ±0.025 mm; tighter needs manual | 8: Bead Blast, Powder Coat, Polish, Nickel/Zinc Plate, Anodize, Hard Anodize, Black Oxide, Passivate | 5-axis simultaneous moves need clearance for spindle/holder; long stick-out past thin walls under 0.8 mm risks collision and chatter — shorten tools or thicken local stock. | $55/h, setup $60 |
| CNC Turning (CNC 车削) | $117.92 median ($80–$290.74) | ISO 2768-m; ±0.05 mm; ±0.025 mm; tighter needs manual | 8: Bead Blast, Powder Coat, Polish, Nickel/Zinc Plate, Anodize, Hard Anodize, Black Oxide, Passivate | Turned bars with length/diameter above ~3–4× without a tailstock or steady rest chatter; thin tubular walls under 0.8 mm amplify ovality under chuck pressure. | $22/h, setup $20 |
| SLM / DMLS (SLM / DMLS) | $4022.82 median ($2800.17–$4177.43) | ISO 2768-m; tighter needs manual | 8: Bead Blast, Powder Coat, Polish, Nickel/Zinc Plate, Black Oxide, Passivate, Anodize, Hard Anodize | SLM thin-wall proxy under 0.8 mm (same threshold family as CNC) risks incomplete melt tracks and warp — thicken or orient flat to plate. | $45/h, support removal min $15/part |
Material data
Contract fields from the material endpoint. A missing number is unknown, not an estimate.
| Property | Value |
|---|---|
| density_g_cm3 | unknown |
| tensile_mpa | unknown |
| hardness | unknown |
| thermal_conductivity_w_mk | unknown |
Finishes
Finishes for SS 316 from rates v1.1 only — USD/part adders, not a full quote. Filtered per material compatibility.
- For SS 316, Bead Blast (bead_blast) adds $5 USD per part with no batch minimum in rates from rates v1.1 finishes_usd_per_part.
- For SS 316, Black Oxide (black_oxide) adds $6 USD per part with no batch minimum in rates from rates v1.1 finishes_usd_per_part.
- For SS 316, Passivate (passivate) adds $6 USD per part with no batch minimum in rates from rates v1.1 finishes_usd_per_part.
- For SS 316, Powder Coat (powder_coat) adds $12 USD per part with no batch minimum in rates from rates v1.1 finishes_usd_per_part.
- For SS 316, Polish (polish) adds $15 USD per part with no batch minimum in rates from rates v1.1 finishes_usd_per_part.
- For SS 316, Nickel/Zinc Plate (nickel_or_zinc_plate) adds $10 USD per part with batch minimum $50 from rates v1.1 finishes_usd_per_part.
Browse industry leaves under this material — same alloy, different application pages (aerospace, medical, automation, …).
Child pages
Questions
Does this CNC lathe SS 316 hub show a price?
316 leaf SAMPLE_GEOM band — rates-true; do not invent medical certification premiums in the public mid. Public sample band: qty 10 mid $164.7 ($144.94–$184.47); qty 100 mid $909.01 ($799.93–$1018.09) (USD, public ±12%, rates v1.1). Not a confirmed quote. This hub is authorized for index, follow (not a ranking claim).
Where are the SS 316 property numbers?
Density, tensile strength, hardness, and thermal conductivity stay unknown until the materials API verifies them. Tolerance and finish names in the comparison table come from the hubs-enrich pack, not from invented ISO grades.
Which industry pages does this hub link to?
Batch1 child leaves only: Aerospace, Drone, Medical, Robotics. Pairs that are not in the matrix are omitted.